We are given a sequence ${a_n}$ such that $a_1 = 1$ and $a_{n+1} = 3a_n + 2$. We need to find the value of $a_4$.

AlgebraSequences and SeriesRecursive Sequences
2025/4/18

1. Problem Description

We are given a sequence an{a_n} such that a1=1a_1 = 1 and an+1=3an+2a_{n+1} = 3a_n + 2. We need to find the value of a4a_4.

2. Solution Steps

We are given the recursive formula an+1=3an+2a_{n+1} = 3a_n + 2 and a1=1a_1 = 1.
We can use this to find a2,a3,a4a_2, a_3, a_4.
a2=3a1+2=3(1)+2=5a_2 = 3a_1 + 2 = 3(1) + 2 = 5
a3=3a2+2=3(5)+2=15+2=17a_3 = 3a_2 + 2 = 3(5) + 2 = 15 + 2 = 17
a4=3a3+2=3(17)+2=51+2=53a_4 = 3a_3 + 2 = 3(17) + 2 = 51 + 2 = 53

3. Final Answer

a4=53a_4 = 53

Related problems in "Algebra"

The problem asks to find the general term for the sequence 1, 5, 14, 30, 55, ...

SequencesSeriesPolynomialsSummation
2025/6/27

The problem asks us to find the axis of symmetry and the vertex of the graph of the given quadratic ...

Quadratic FunctionsVertex FormAxis of SymmetryParabola
2025/6/27

The problem asks us to sketch the graphs of the following two quadratic functions: (1) $y = x^2 + 1$...

Quadratic FunctionsParabolasGraphingVertex FormTransformations of Graphs
2025/6/27

Given two complex numbers $Z_a = 1 + \sqrt{3}i$ and $Z_b = 2 - 2i$, we are asked to: I. Convert $Z_a...

Complex NumbersPolar FormDe Moivre's TheoremComplex Number MultiplicationComplex Number DivisionRoots of Complex Numbers
2025/6/27

The problem involves complex numbers. Given $z_1 = 5 + 2i$, $z_2 = 7 + yi$, and $z_3 = x - 4i$, we n...

Complex NumbersComplex Number ArithmeticComplex ConjugateSquare Root of Complex Number
2025/6/27

The problem asks us to find the range of values for the constant $a$ such that the equation $4^x - a...

Quadratic EquationsInequalitiesExponentsRoots of EquationsDiscriminant
2025/6/27

Given $A = \{1, 2\}$ and $B = \mathbb{R}$, we need to sketch the graph of $R = A \times B$. We need ...

SetsRelationsFunctionsCartesian ProductGraphs
2025/6/27

Solve the equation $ \lceil x^2 - x \rceil = x + 3 $ for $x \in \mathbb{R}$, where $ \lceil x \rceil...

Ceiling FunctionQuadratic EquationsInteger Solutions
2025/6/27

A lemming runs from point A to a cliff at B at 4 m/s, jumps over the edge and falls to point C at an...

Word ProblemLinear EquationsDistance, Speed, and Time
2025/6/27

Given three matrices $X$, $Y$, and $Z$ as follows: $X = \begin{bmatrix} 5 & 4 & -7 \\ -3 & p & 5 \en...

MatricesMatrix TransposeMatrix MultiplicationMatrix Addition
2025/6/27